Bioengineering of important secondary metabolites and metabolic pathways in fenugreek [Trigonella foenum-graecum L.]

Fenugreek [Trigonella foenum-graecum L.] has a long and respected history of medicinal uses in Middle East and Persian medicine. The hypocholesterolaemic and hypoglycaemic effects of fenugreek were attributed to its major steroidal sapogenin, diosgenin and its major alkaloid, trigonelline. The knowledge of diosgenin and trigonelline biosynthesis is derived from studies of cholesterol and nicotinic acid production through acetyl-CoA [Right Arrow] mevalonate [Right Arrow] isopentenyl pyrophosphate [Right Arrow] squalene [Right Arrow] lanosterol [Right Arrow] cholesterol [Right Arrow] diosgenin and quinolinic acid [Right Arrow] nicotinamide adenine dinucleotide [Right Arrow] nicotinamide [Right Arrow] nicotinic acid [Right Arrow] trigonelline pathways, respectively. This paper reviews the secondary metabolites and metabolic pathways of diosgenin and trigonelline production in fenugreek as a medicinal plant and economical crop